not that I am unable to view videos on instructables, but more and more instructables are simply a video, sometimes with two sentences, sometimes not even that.
Not that I dislike video tutorials and such, but many people still have low bandwith, or (like me) can not turn on the sound all the time since it would bug other people.
Also sometimes it is more usefull to read instructions, steps and technical data. Plus there might be deaf people interested in some project but unable to understand all steps due to the fact some videos will depend on audio explanation only.
My two cents:
Include a minimum text length check for instructables.
Video only should be youtube or such, not Instructables.